Water-heater.



. '794,931- PATENTED JULY 18, 1905.

M. PLATLAND.

WATER HEATER.

APPLICATION FILED OUT. 19,1904.

l ly-1 2 I 7 7 \u um NITED I STATES Patented July 18, 1905.

PATENT OFFICE.

WATER-HEATER.

SPECIFICATION forming part of Letters Patent No. 794,931, dated July 18, 1905.

Application filed October 19, 1904. Serial No. 229,074.

To all whowt it ntcty concern:

Be it known that I, MARTIN FLATLAND, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Rapid VVater- Heaters, of which the following is a specification.

This invention relates to improvements in rapid water-heaters, the object of the invention being to provide a simple and compact spiral form,

apparatus by which water can be heated very rapidly and with a comparatively small expenditure of fuel.

In the accompanying drawings, Figure 1 is a vertical section of the apparatus. Fig. 2 is a horizontal section thereof.

Referring to the drawings, 1 represents a casing lined with an asbestos or other insulating material 2, through which the Water-supply pipe 3 enters at the bottom and is connected to an axial threaded opening 4 in a casting 5 of having at its periphery a threaded tangential opening 6, into which is screwed the round end of a pipe 7. This pipe is a double helix in form, narrow at top and bottom and wide in the middle and connected at its upper end with a casting 8, similar in plan view to the casting 5. The pipe 7 is perfectly round at its lower end, so as to permit it to be screwed into the threaded opening 6 in the casting, but is gradually flattened as it curves outward spirally and then again gradually changes from a flattened cross-section to a rounded pipe, where it is connected to the upper casting. 1 preferably make this pipe of what is known as seamless steel tubing, in two pieces precisely similar, having flattened ends connected together by a sleeve 9, brazed on said ends. This coil is new connected to a similar coil 10, having two cast ings 11 12 connected therewith, the connection being made by a short upright joint or piece of pipe 13. As many of these coils as may be desired may be inclosed within the casing 1; but I have in the present instance shown only two. From the uppermost coil a discharge-pipe 14 leads to conduct the water to the point where used. A gas-burner 15 is here shown, although any suitable fuel may be used,'16 being the outlet-pipe for the products of combustion. The casting 5 has two of the openings i diametrically opposite to each other for convenience of fitting, into one of which is screwed a short closed pipe 17.

This form of apparatus is very effective in heating water on account of the flattening of the pipe, which thus presents a very large extent of heating-surface compared with the amount of water passing therethrough. The spiral form is also effective because it gives a long path for the water, and therefore also a comparatively large heating-surface, and at the same time facilitates the continuous flow of the water. The apparatus is also very efflcient and heats water rapidly, because the path of the water is continually upward, and at no point of said path is there any dead-level tending to obstruct the flow of water.

The spirally shaped casting having the openings connected with the water-pipes-the one a tangential opening and the other an opening at right angles to the tangential path is also an important feature of my invention.

1. A water-heater comprising a spiral flattened water-tube, and means for conducting heated gases in a direction to impinge directly against the broad or flattened surface of the tube to heat the same, substantially as described.

2. A water-heater comprising a water-tube rounded'at an end and flattened at a mediate portion, a water-conduit connected to said rounded end, and means for conducting heated gases in a direction to impinge directly against the broad or flattened surface of the tube to heat said tube, substantially as described.

3. A Water-heater comprising a spiral casting having a tangential threaded opening, and an axial threaded opening, and closed on the side opposite to said axial opening, pipes screwed into said openings, and means for heating the same, substantially as described.

4. A water-heater comprising a spiral casting having atangential opening, a spiral tube rounded at the end and screwed into said opening, said tube having a mediate flattened portion, and means for heating the same, substantially as described.

5. A Water-heater comprising two spiral castings having tangential openings, a spiral tube having its ends rounded and screwed into said openings, the mediate portion of the tube being flattened, and means for heating the same, substantially as described.

6. A Water-heater comprising tWo castings, a tube consisting of tWo sections, each section comprising a rounded end secured to one of 10 the castings and being gradually flattened toward the other end, a sleeve connecting said flattened ends, and means for heating, sub-V stantially as described.

In Witness whereof I have hereunto set my hand in the presence of tWo subscribing wit- 1! HBSSGS.

MARTIN FLATLAND. WVitnesses:

FRANCIS M. WRIGHT,

BEssIE GORFINKEL. 

